Scrambling and unscrambling method for composite video signals a

Details Scrambling and unscrambling method for composite video signals a Scrambling and unscrambling method for composite video signals a

1991-12-23

1993-05-04

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 16, 380 17, 380 20, H04N 7167

Patent

active

052088561

ABSTRACT:
The method of the invention consists, during the transmission of composite video signals, in the inclusion therein of series of access messages (ECM1, ECM2) and, during the unscrambling, carried out using a chip card reader whose chip card comprises encoded digital data, in using an interactive method of identification of a digital signature.

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patent: 4484027 (1984-11-01), Lee et al.
patent: 4723282 (1988-02-01), Marie et al.
patent: 4748668 (1988-05-01), Shamir et al.
patent: 4751732 (1988-06-01), Kamitake
patent: 4916737 (1990-04-01), Chomet et al.

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